AD7150 Analog Devices, AD7150 Datasheet - Page 2

• Manufacturer Part Number: AD7150
• Description: Ultra-Low Power, 2-Channel, Capacitance Converter for Proximity Sensing
• Manufacturer: Analog Devices

Specifications of AD7150

• Resolution (bits): 12bit
• # Chan: 2
• Sample Rate: n/a
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: SE-Uni
• Ain Range: 0.5 pF,1 pF,2 pF,4 pF
• Adc Architecture: Sigma-Delta
• Pkg Type: SOP

AD7150
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 7
Architecture and Main Features ................................................... 10
Register Descriptions ..................................................................... 14
REVISION HISTORY
11/07—Revision 0: Initial Version
Timing Specifications .................................................................. 4
ESD Caution.................................................................................. 5
Capacitance-to-Digital Converter............................................ 10
CAPDAC ..................................................................................... 10
Comparator and Threshold Modes.......................................... 11
Adaptive Threshold.................................................................... 11
Data Average ............................................................................... 11
Sensitivity..................................................................................... 12
Hysteresis..................................................................................... 12
Timeout........................................................................................ 12
AutoCAPDAC Adjustment ....................................................... 13
Power-Down Timer ................................................................... 13
Power Supply Monitor ............................................................... 13
Status Register ............................................................................. 15
Data Registers ............................................................................. 16
Average Registers........................................................................ 16
Rev. 0 | Page 2 of 28
Serial Interface ................................................................................ 21
Hardware Design Considerations ................................................ 23
Outline Dimensions ....................................................................... 26
Fixed Threshold Registers ......................................................... 16
Sensitivity Registers ................................................................... 16
Timeout Registers....................................................................... 17
Setup Registers............................................................................ 18
Configuration Register .............................................................. 19
Power-Down Timer Register .................................................... 20
CAPDAC Registers .................................................................... 20
Serial Number Register.............................................................. 20
Chip ID Register......................................................................... 20
Read Operation........................................................................... 21
Write Operation.......................................................................... 21
AD7150 Reset ............................................................................. 22
General Call ................................................................................ 22
Overview ..................................................................................... 23
Parasitic Capacitance to Ground.............................................. 23
Parasitic Resistance to Ground................................................. 23
Parasitic Parallel Resistance ...................................................... 23
Parasitic Serial Resistance ......................................................... 24
Input Overvoltage Protection ................................................... 24
Input EMC Protection ............................................................... 24
Power Supply Decoupling and Filtering.................................. 24
Application Examples ................................................................ 25
Ordering Guide .......................................................................... 26